2027 ICD-10-CM Diagnosis Code I00Rheumatic fever without heart involvement
ICD-10-CM Codes›I00–I99›I00-I02›I00
- Billable — Valid for Submission
- Not Chronic
I00 is a billable ICD-10-CM diagnosis code for rheumatic fever without heart involvement. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 545 through 547. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Acute rheumatic heart disease and Bacterial infections.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Acute rheumatic fever
- Annular erythema
- Erythema marginatum in acute rheumatic fever
- Migratory polyarthritis
- Recurrent rheumatic fever
- Rheumatic arthritis
- Rheumatic fever
- Rheumatic fever without heart involvement
- Rheumatic pneumonitis
- Subacute arthritis
- Subacute arthropathy
- Subacute rheumatic arthritis
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to I00: its own notes plus those printed at Chapter 9. A note printed at a category, block or chapter applies to every code under it.
Includes
Further defines, or gives examples of, the content of the category.
- arthritis, rheumatic, acute or subacute
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
- systemic connective tissue disorders (M30-M36)
- transient cerebral ischemic attacks and related syndromes (G45.-)
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name I00, its category, or a range that includes it.
Applicable To 5
These notes mention I00.
- I01.0 Acute rheumatic pericarditisAny condition in I00 with pericarditis
- I01.1 Acute rheumatic endocarditisAny condition in I00 with endocarditis or valvulitis
- I01.2 Acute rheumatic myocarditisAny condition in I00 with myocarditis
- I01.8 Other acute rheumatic heart diseaseAny condition in I00 with other or multiple types of heart involvement
- I01.9 Acute rheumatic heart disease, unspecifiedAny condition in I00 with unspecified type of heart involvement
Excludes1 2
These codes carry an Excludes1 note naming I00: they are not reported together with it, unless the two conditions are unrelated.
Excludes2 2
These codes carry an Excludes2 note naming I00: its condition is not part of those codes, and both may be reported when the patient has both.
- I51 Complications and ill-defined descriptions of heart disease
- Block J09-J18 Influenza and pneumoniarheumatic pneumonia (I00)
Code First 1
These codes say to code first a condition named in the note, and I00 is one of the conditions named.
- J17 Pneumonia in diseases classified elsewhererheumatic fever (I00)
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Streptococcal Infections
Strep is short for Streptococcus, a type of bacteria that often lives in your nose and throat. Most strep infections are mild, but some may become serious depending on your overall health.
The full article covers:
- What are streptococcal infections?
- How do streptococcal infections spread?
- Who is more likely to get a streptococcal infection?
- What are the symptoms of streptococcal infections?
- How are streptococcal infections diagnosed?
- What are the treatments for streptococcal infections?
- Can streptococcal infections be prevented?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert I00 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About I00Overview
What is the ICD-10 code for rheumatic fever without heart involvement?
The ICD-10-CM code for rheumatic fever without heart involvement is I00. It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is I00 (Rheumatic fever without heart involvement) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report rheumatic fever without heart involvement on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does I00 group to?
When rheumatic fever without heart involvement is the principal diagnosis on an inpatient stay, it groups to MS-DRG 546, 545, 547, with relative weights from 0.7160 to 2.3903 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of I00?
Under the General Equivalence Mappings, rheumatic fever without heart involvement converts to ICD-9-CM 390 (rheum fev w/o hrt involv). The mapping is a direct match.
